The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 30, 2007
Filed:
Nov. 07, 2002
Qin Liu, Fremont, CA (US);
Lin Yang, Fremont, CA (US);
Legend Silicon Corporation, Fremont, CA (US);
Abstract
Method and system for determining whether one or more multipath signals is present in a received signal frame that includes a reference symbol (RS) sequence RS(t;m) as part of the frame, and for iteratively evaluating a multipath signal that is present. The RS sequence index (m) for the frame is identified, and first and second Fourier transforms Φ(f;m;ref) and Φ(f;rec) for the received frame are provided for a selected time segment IS that includes the RS sequence of the received frame. An inverse Fourier transform σ(t;m) of the ratio of the transforms is computed and analyzed. If at least one multipath signal is present, σ(t;m) is nonlinearly filtered, and the filtered function is convolved with RS(t;m). This convolution represents a received signal extension, due to multipath signal(s) presence. A refinement procedure analyzes a contribution to multipath signals from the preceding frame(s). The procedure is iteratively driven toward an optimal representation of any multipath signal(s) present.